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The Robert Waugh House, also known as the Sparland Octagonal House, is located in the Marshall County village of Sparland, Illinois, on a steep hillside overlooking the Illinois River. The house has been listed on the National Register of Historic Places since October 1978. The house was built by Robert Waugh, on land purchased for the sum of 25 dollars. It is the only site in Marshall County listed in the Register. It is a private house and has "pie-shaped rooms around a central spiral staircase".